After the authors of the proposed graduated tax in Massachusetts submitted their proposal for legislative approval in 2017, the federal government placed a $10,000 limitation of deductibility of state and local taxes on federal tax returns. This unforeseen change in the federal tax code had the effect of turning what would have been a 58 percent increase in average state income tax payments among Massachusetts millionaires, from $160,786 to $254,355, into what is essentially a 147 percent increase when the federal SALT limitation is included in the calculation. This substantial change should be taken into consideration by voters when they contemplate approving the surtax proposal.
